Indiana Estate Tax Filing Guide for High-Value Estates

If you're managing or inheriting a high-value estate in Indiana, the documentation requirements can feel overwhelming. Estates worth several million dollars involve detailed asset disclosures, precise valuations, and strict filing timelines that differ from standard estate filings. Getting the paperwork wrong can trigger audits, penalties, or unnecessary tax liability. This guide walks you through exactly what documents you need, how to prepare them, and where most people go wrong with Indiana estate tax documentation for high-value estates.

Does Indiana Have a State Estate Tax?

Indiana repealed its state-level estate tax in 2013. However, that doesn't mean high-value Indiana estates escape federal estate tax obligations. Estates exceeding the federal exemption threshold currently around $13.61 million per individual for 2024 are subject to federal estate tax. If you're an executor or beneficiary of a large Indiana estate, you still need to file IRS Form 706, the United States Estate (and Generation-Skipping Transfer) Tax Return.

Understanding the distinction between state and federal requirements is the first step. Many families in Indiana assume that no state tax means no documentation at all. That assumption can cost hundreds of thousands of dollars if the federal filing is missed or filed incorrectly. You can learn more about which forms are required for estate tax returns to make sure you're covering every obligation.

What Documents Do You Need for a High-Value Indiana Estate Tax Filing?

Federal estate tax filings for high-value estates require extensive documentation. Here's what the IRS expects to see:

IRS Form 706 – The primary federal estate tax return, filed within nine months of the date of death (with a possible six-month extension using Form 4768)
Death certificate – A certified copy from the Indiana county where the decedent passed away
Will and trust documents – Any probated will, living trusts, irrevocable trusts, or amendments
Complete asset inventory – Real estate, bank accounts, brokerage accounts, retirement accounts, business interests, life insurance policies, and personal property valued at fair market value on the date of death
Appraisal reports – Professional, independent appraisals for real property, closely held businesses, collectibles, artwork, and any asset without a readily determinable market value
Debt and liability records – Mortgages, loans, credit lines, and unpaid bills owed by the decedent
Prior gift tax returns – IRS Form 709 filings for any lifetime gifts the decedent made, since these reduce the available exemption
Beneficiary designations – Documentation for life insurance, retirement plans, and transfer-on-death accounts
Jointly held property records – Documentation showing contribution percentages for jointly owned assets

For a more detailed breakdown, see our guide on how to prepare estate settlement documents in Indiana.

When Is the Filing Deadline, and What Happens If You Miss It?

Form 706 is due nine months after the date of death. You can request a six-month extension by filing Form 4768 before the original due date, but this only extends the filing deadline not the payment deadline. Federal estate tax payments are still due within nine months of death.

Late filings trigger a failure-to-file penalty of 5% of the unpaid tax per month, up to 25%. Late payments carry a separate penalty of 0.5% per month. Interest accrues on unpaid amounts from the original due date. For high-value estates, these penalties add up fast.

How Do You Value Assets for a High-Value Estate?

The IRS requires all estate assets to be reported at fair market value on the date of death not the original purchase price. For publicly traded securities, this is straightforward. But high-value estates often contain assets that require professional appraisal:

Real estate – Residential, commercial, and vacant land all need independent appraisals from licensed professionals
Business interests – Closely held corporations, LLCs, and partnerships need business valuations that account for discounts for lack of marketability and minority interest, where applicable
Art, jewelry, and collectibles – Items worth over $3,000 require qualified appraisals, and items worth over $50,000 may need a Statement of Value from the IRS
Personal property – Vehicles, boats, equipment, and household goods should be appraised if collectively significant in value

Using the IRS estate tax resources can help clarify valuation standards, but high-value estates almost always need professional valuation support to avoid challenges.

Alternate Valuation Date

Executors can elect to value the estate six months after the date of death using IRS Form 706, Schedule G only if doing so reduces both the gross estate value and the estate tax liability. This option can save significant money if the market drops after the decedent's death, but it requires careful calculation.

What Are Common Mistakes With Indiana High-Value Estate Documentation?

After working through many large estate filings, these are the errors that show up most often:

Forgetting lifetime gifts – Gifts made within three years of death may be pulled back into the taxable estate under certain circumstances. Failing to track and report prior Form 709 filings is a major oversight.
Underreporting asset values – Using outdated or informal valuations instead of proper appraisals invites IRS scrutiny.
Missing life insurance proceeds – Life insurance the decedent owned or had incidents of ownership over is included in the gross estate, even if paid to a specific beneficiary.
Ignoring jointly held property – The full value of jointly held property with a non-spouse may be included unless you can prove otherwise.
Not documenting deductions properly – Charitable deductions, marital deductions, and administration expenses all reduce the taxable estate, but only if properly documented and itemized on the return.
Confusing estate settlement with estate tax filing – Probate administration and tax compliance are separate tracks. Our overview of the estate settlement process in Indiana during probate explains how they overlap and where they differ.

Should You Use the Marital Deduction or Portability Election?

For married couples, two powerful tools can reduce or eliminate federal estate tax:

Unlimited marital deduction – Assets passing to a surviving spouse (who is a U.S. citizen) are fully deductible from the gross estate. This means no estate tax is due at the first spouse's death, but the full estate will be taxable at the survivor's death.

Portability election – The executor can transfer the deceased spouse's unused exemption to the surviving spouse by filing Form 706, even if no estate tax is owed. This effectively doubles the survivor's exemption. But portability must be elected it doesn't happen automatically. If the first spouse's estate doesn't file Form 706, the unused exemption is lost forever.

What Records Should Executors Keep After Filing?

The IRS can audit estate tax returns up to three years after filing, or longer if they suspect substantial underreporting. Keep these records for at least that long:

Copies of all filed forms and schedules
Appraisal reports and supporting documentation
Bank and brokerage statements as of the date of death
Correspondence with the IRS
Proof of tax payments made
Prior gift tax returns
Trust documents and amendments
Receipts for deductible expenses (funeral costs, legal fees, executor fees)

Our article on estate tax filing instructions for Indiana executors covers the full filing workflow from start to finish.

What Should You Do Right Now If You're Facing a High-Value Estate Filing?

Here's a practical checklist to get started:

Determine if a federal return is required. Add up the gross estate value including life insurance and prior taxable gifts. If it exceeds the current federal exemption, Form 706 is mandatory.
Gather all asset documentation immediately. Bank statements, property deeds, brokerage records, business agreements, insurance policies start compiling these within the first few weeks.
Hire qualified appraisers. Engage licensed appraisers for real estate, business interests, and high-value personal property early. Appraisals take time, and you need them before the filing deadline.
Pull prior gift tax returns. If the decedent made large lifetime gifts, locate copies of any Form 709 filings. These affect the available exemption.
Decide on portability. If the decedent was married, discuss with your tax professional whether electing portability makes sense it almost always does.
Track every deductible expense. Funeral costs, legal fees, executor commissions, and debts of the decedent all reduce the taxable estate. Keep detailed records and receipts.
File Form 4768 if you need more time. The nine-month deadline arrives faster than most executors expect. Request the extension before the due date if you're not ready.
Work with an estate tax attorney or CPA experienced in high-value filings. The complexity of these returns increases sharply above the exemption threshold, especially when business valuations, portability, or multi-state property are involved.

Documentation mistakes on high-value estate filings are expensive to fix and stressful to defend. Taking a methodical approach from the start collecting every record, securing professional appraisals, and understanding the federal filing requirements puts you in the strongest position to file accurately and on time.